As you say I do thank you so you know that it really is (I) thank you , with I in ellipsis. Therefore, there is no special significance to the form of the verb that thank is, I suppose.
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KrisFeb 13 '12 at 14:50

@Kris: So... are you implying that Do thank you! is valid?
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Armen ԾիրունյանFeb 13 '12 at 14:51

No. You may not use an ellipsis everywhere. Only where an ellipsis can be interpreted would it make sense and therefore be acceptable.
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KrisFeb 13 '12 at 14:54

@Kris: OK, I see. So you're basically saying that thank in thank you is indicative mood 1st person singular, just like in I thank you. Is that correct?
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Armen ԾիրունյանFeb 13 '12 at 14:56

2

I am just saying that Thank you is I Thank you with an ellipsis.
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KrisFeb 13 '12 at 14:58

@Armen Tsirunyan: Doubtless in earlier/more considered usages such as "Damn you!", you could have said it was an abbreviated "performative", but that's not really the case with modern "Fuck you!", *"Bugger it!", etc. The profanities have switched to a different, more vague grammatical role. No-one would seriously imagine today that "Sod it!" stands in for "I sodomise it!"
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FumbleFingersMar 14 '12 at 4:37